Labelmaster’s Packing List Enclosed Envelopes with their bold message in a bright red box are a smart and economical way to keep your transportation documents intact and always visible to shippers and receivers. These are back loading and protect important invoices and shipping papers from damage caused by dirt or moisture. Their tamper-evident storage pocket must be torn or cut open to retrieve the contents, and their pressure-sensitive adhesive sticks to just about any kind of shipping container. They measure 4 1/2 x 6 in. and are sold in cases of 1000.